Analysis of Spatio-temporal Pattern Evolution of Marine Hydrological Elements in Zhoushan Sea Area

As an important fishery in China, the changes of marine hydrological elements have seriously affected the development of Zhoushan. The spatio-temporal pattern evolution of marine hydrological elements and the response of marine hydrological elements and El-Nino in Zhoushan sea area are analyzed in this paper. The results are as follows: (1) Marine hydrological elements have obviously seasonal variation and spatial distribution; (2) In 1995-2016, sea surface salinity (SSS) and sea surface temperature (SST) have a yearly upward trend, chlorophyll concentration (Chl) has a yearly downward trend; (3) The response of marine hydrological elements at different El-Nino stages shows a difference.